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【单选题】
( )的主传动方式大大简化了主传动系统的结构，有效地提高了主轴部件的刚度，
A.
通过带传动
B.
由调速电动机直接驱动
C.
带有变速齿轮
D.
以上答案都不对
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参考解析：
知识点：
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皮皮学刷刷变学霸
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内胚层
B.
中胚层
C.
外胚层
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滋养层
E.
蜕膜
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【单选题】l'm leaving for New York( )three day's time.
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for
B.
in
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at
D.
on
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【简答题】The Tokyo earthquake of【L11】______happened just before the middle of the day.
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A.
Ⅰ
B.
Ⅰ,Ⅱ
C.
Ⅰ~Ⅳ
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【单选题】对水航速是船舶在 情况下的对水航速,I.无风流;II.有风无流;III.有流无风;IV.有风流
A.
仅I
B.
I~IV
C.
I、II、IV
D.
I、Ⅱ
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【单选题】Teachers' Day is______. [     ]
A.
September l0th
B.
October 9th
C.
  August l0th
D.
December 12th
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【单选题】l' d really like to be a photographer and spend the _______ day taking photographs!
A.
first
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whole
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all
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best
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【单选题】相对计程仪航速是船舶在 情况下的对水航速。I.无风流;II.有风无流;III.有流无风;IV.有风流。
A.
Ⅰ
B.
Ⅰ，Ⅱ
C.
Ⅰ～Ⅳ
D.
Ⅰ，Ⅱ，Ⅳ
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【简答题】阅读理解 Children in the USA like K Day very much. K is for kites. March 7 is the day. On that day lots of children go out in the open air. They take their kites with them. Some kites are very big. Others...
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【单选题】________,Valentine's Day is celebrated. [     ]
A.
On May l st
B.
On February 14th
C.
On June l st
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On September l st
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相关题目：
【单选题】心脏由哪一层分化而来
A.
内胚层
B.
中胚层
C.
外胚层
D.
滋养层
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【单选题】l'm leaving for New York( )three day's time.
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for
B.
in
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at
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A.
Ⅰ
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Ⅰ,Ⅱ
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Ⅰ~Ⅳ
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仅I
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I~IV
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I、II、IV
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Ⅰ
B.
Ⅰ，Ⅱ
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Ⅰ～Ⅳ
D.
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【简答题】阅读理解 Children in the USA like K Day very much. K is for kites. March 7 is the day. On that day lots of children go out in the open air. They take their kites with them. Some kites are very big. Others...
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【单选题】________,Valentine's Day is celebrated. [     ]
A.
On May l st
B.
On February 14th
C.
On June l st
D.
On September l st
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